Nelson b



Aug. 25, 1925.

N. E. MANN ELECTRICALLY HEATED UTENSIL Filed Jan. 1s, 1924 #QQM1M7/ lf n(24"8' i 4 .321! IAE-3' ATTORNEY.,

Patented A ug. 2.5, 1.9.25.

Parla-.lar ortica. 1

NELSON n. MANN, or NawrNe'rON, CONNc'rICUT, AssIeNon To MANN-irre,BOWMAN a oOurANY, or nnnIDEN, CONNECTICUT, a CORPORATION or CONNECTICUT.

ELEC'raICALLY-HEATED TENsn..

`App1ioation led January 16, 1924. VSerial-No. 688,484.

To all lwhom 'it may concern Be it known that I, NELSON E. MANN', acitizen ofthe United States, residing at Newington, county ofl Hartford,State of Connecticut, have invented certain new and` useful Improvementsin Electrically-Heated Utensils, of which the following 1s a full,clear, and exact description. My invention relates to electricallyheated utensils, and has special reference to devices for Cutting offthe current from the utensil when the temperature v'reaches apredetermined degree. I

The object of my invention is to provide an electrically heated utensilwith a fusible cut out, the two being combined in such a way that theaction is more certain and reliable.

It further has for itsobject to provide an improved fusible cut out.

The followingis a description of my in Vention, reference being hadtothe accompanying drawing, in which, 1

Figure 1 is a sectional elevation, taken substantially on the, line 1-1of Fig. 2, of the lower portion of a percolatorembodying the features ofthe invention in theirpreferred form; i

Fig. 2 is a bottom plan view of the percolator with parts broken awayand a cover closing a portion of` the bottom of the percolator removed yFig. 3 is a detail sectional elevation, with parts removed, takensubstantially on 'the line 3-3 of Fig. 1;

Fig. 4 is a detail sectionalA view taken on the line 4f4 of Fig. 2; and

Figs. 5 and 6 are etail views in. perspective of component parts,respectively, of the cut out device of the percolator, the latter partbeing shown inverted.

The ercolator illustrated in thedrawing is provided with a base 2; aliquid receptacle 4, a heating chamber 6 connected with the receptacle 4and having an inner wall shown in dots at 7, a heating unit 8 surroundinthe heating chamber, and an electrical p ug socket 10, which parts maybe of a well known construction. The percolator is further provided witha depending-heat retaining sleevel or skirt 12 surroundino the'heatlngchamber and heating unit anf spaced a distance therefrom; This skirt 121s provided with an outwardly turned flange 14 at its lower end to whichis secured by screws 1,6 a disk 18,01? heat resisting insulatingmaterial, such as pyroplait that extends over the bottom wall of theeatmg chamber, the disk 18 andthe skirt 12 forming a heat retainingcasing for the heating chamber. The space between the lower end of thiscasing and the base 2is closed. by an annular member 20 which isysecured to the underside of the diskf, 18 by means of the screws 16.The member 20 is provided with a vertical cylindrical walll portion 22into which is fitted a removable e cover 'or closure 24.

In the illustrated construction two contact strips 26 of copper, brassori, other material having a high heat and electrical conductivity areprovided having their outerl portions set into parallel grooves 28,respectively, in the under side of the insulation Vdisk 18 and securedtherein by means of screws 30 which also serve as binding screws.v Oneof the ,contact strips 26 is connectedv with one of the bindin [posts 32of the plug socket 1;',0 by means o a wire 34 which is heldin contactwith the strip by its binding post 30. The other Contact strip 26 is'connected vwith one of the ter- 'mlnals 36 of the heating unit, b itsbinding posty 30.` The other termina 38 of the heatlng unit is connectedwith one end of a conducting strip or plate40 by means of post 44 of theplug socket 10. The Contact strips 26 are provided with vertical por-.tions 46 that engage the inner wall of slots 48 extending through thecover disk 18 and forming continuatlons of the grooves 28. The inner endportions'of the Contact strips 26 are bent at right angles to thevertical portions 46 andl are fiat against theunder side of a relativelythin disk ofl mica 49 that is laid ainstthe bottom wall of the heatingcham er 6. Thefends of the fuse are clamped against the end parts of theContact strips 26, the bottom of the chamber serving to resist thepressure of such clamping action.

The fuse, whichs illustrated in Fig.` 6, is a reversible fuse andcomprises a flat rectangular strip or bar 50 of easil fusible materialand relatively large at terminal nickel plated pieces 52 of brass,copper or other metal of high electrical and heat `c onductivity, havingtheir inner ends abutting y ing a heating chamber,

unit for 'the chamber, two electrical contactv strips laid a ainst thewall of said chamber lfuse is not engaged by the ends of the strip andsoldered thereto by a more easily fusible solder such as pure tin.v Thebody of the fuseinay extend beyond the plane of the upper surface of theterminals 52 so 'as to be adjacent to or in contact with thev mica 49.The fuse is ap` plied to the device by passing it through arectangularaperture 56 in the cover disk 18, the aperture 56 beingarranged at right angles to the grooves 28 and the grooves leading intothe aperture. The fuse is positioned with its terminal pieces 52extending over the inner ends of the contact strips 26, respectively, soas to be in series with the heating unit. The terminal pieces are firmlypressed against the strips by means of a spacing block 58 which isremovably inserted through the' aperture 56 and is held in the apertureby Ymeans of two clamping plates 60 comprising. rectangular piecesloosely mounted on screws 62 secured in apertures in the cover disk 18and provided with thumb nuts 64 for clamping the plates 60 firmlyagainst the under side of the ends of the s ace block 58. The spaceblock 58 is provi ed with a central rectangular o ening 66 so that thefusible portion 50 o the the block 58 and is exposed so as to fallthrough the opening 66 when either the solder or the portion 50 melts. t

With this construction it will be a parent that upon the wall of theheating cv amber becoming overheated by the heating unit when the waterin the chamber is exhausted,

heat from the chamber is conducted directly through the contact strips26 and the fuse terminals 52 to the ends of'the fuse bar 50 so as toimmediatel fuse the bar or ortions thereof Vand cut o the current. eclose contact of the ends of the contact stri s 26 with the bottom wallof the heatin c amber, and the close contact of the use terinsurespositive actionV and prevents all electrical trouble caused by poorcontacting surfaces. An-

other advantage of a fuse of theillustrated.-

construction is that there is no fusible or soft metal under pressurewhich is a source of much trouble in many other devices, as theexpansion and contraction of this soft metal draws it awa from thecontacting sunfaces. Also,in t e illustrated construction there arelnosprings to lose their temper by the heat.- Y

As will be evident 'to those skilled in the art2 my invention permits ofvarious modications without departing from the spirit thereof or thescope of the appended claims.

What I claim is:

1. An electrically heated utensil comprisan electrical heating andinsulate therefrom, a fuse comprising "a piece of fusible materialhaving terminal pieces secured on its ends and extending over and incontact with said contact strips, and means for removably clamping saidterminal pieces tightly against said contact strips, said fuse andcontact strips being in series with said heating unit.

2. An electrically heated utensil comprising a heating chamber, anelectrical heating unit therefor, and a fuse having its terminalsclosely adjacent to the Wall of said chamber,

electrically insulated therefrom and connected in series with saidvheating unit.

' 3. An electrically heated. utensil comprising a heating chamber, anelectrical heating unit therefor, two`electrical contact strips laidagainst a wall of said chamber and elecsaid terminal pieces, contactstrips and s eet of insulating material firmly together and against saidwall, said contact strips and fuse being connected in series with saldheating unit.

5. An electrically heated utensil com-. prising a heating chamber havinga bottom wall, an electrical heating unit for said chamber, a casingenclosing the lower por-` tion of said heating chamber having a bottomwall of insulating material, two electrical contact strips secured onsaid bottom wall of said casing and having flat' end portions heldVaga-inst the bottom wall of said heating chamber and insulatedtherefrom, a fuse comprising a piece of fusible material and terminalpieces secured on its ends and extending over said flat end portions ofsaid contact strips, respectively,

and means for clamping said terminal pieces against said fiat endportions of the contact strips comprising a block removably insertedthrough an aperture in the bottoml wall of said casing having its endsengaging said terminal pieces and having a ccntralaperture so as toexpose said piece of I fusible material, said fuse and contact stripsbeing connected in series with said heating unit 6. An electricallyheated utensil comprising a heating chamber, a casing enclosing thelower portion of said heatin chamber and having its bottom wall spacefrom the bottom wall of said chamber, a heating unit for said chamber, afuse adapted to be inserted through an aperture in said bottom wall ofsaid casing to position its terminals Vagainst the bottom wall of saidchamber,

insulating material interposed between said fuse and said bottom wall,and means for clamping the fuse in position comprising'a block adaptedtobe inserted through said aperture so as to cause its ends to engage theterminals of said fuse, and means for holding said block in position,said fuse being connected in series with said heating unit. Y p

7. An electrically heated utensil comprising a heating chamber having abottom waH, lan electrical heating unit surrounding said chamber, acasing enclosing the lower portion of said heating chamber having itsbottom wall of insulating material and eX- tending over the bottom wallof said chamber, two electrical contact strips laid against the bottomwall of said chamber, a fuse comprising a substantially fiat piece offusible metal and flat terminal pieces secured on the 'ends thereof andextending over said Contact strips, means comprising a member removablyinserted in an aperture in said bottoin wall of said casing for clampingsaid fuse terminal pieces against said contact strips, respectively, anda relatively thin piece of insulating material extending over the bottomwall of said chamber for electrically insulating said fuse terminalpieces and said contact strips from said bottom wall, said fuse andcontact strips being connected in series with said heating unit. t

8. An electrically heated utensil comprising a heating. chamber having abottom wall, an electrical heating unit forl said chamber, a casingenclosing the lower portion of said heating chamber having a bottom wallof'insulating material, two electrical concess beneath and inline withsaid piece of' fusible material, said fuse and contact strips lbeing'connected in series with said heating `unit. v

A 9. A fuse comprising a strip of fusible material and flat. electricalcontact pieces having their inner edges abutting the ends of said stripand soldered thereto by solder having a substantially higher fusingpoint than said strip and arranged substantially inthe plane of saidpiece of fusible material. i

10. An electrical heated utensil comprising a heated chamber, anelectrical heating unit for the chamber, two electrical contact membersheld in proximity to the bottom wall of said chamber and insulatedthere- -from, a fuse comprising a strip of material having terminalrpieces soldered on its ends extending over and in contact with saidelectrical contact members, and means for removably clamping saidterminal pieces tightly against said contact members comprising a .blockhaving its ends engaging said terminals and having an aperture of atleast the area of said strip and arranged directly beneath said strip.

, NELsoNv E. MANN.

